package Thread;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: LianBao
 * Date: 2024-08-04
 * Time: 21:14
 */

/**
 * 懒汉模式
 */
class SingletonLazy {
    private static volatile SingletonLazy instance = null;
    private static Object locker = new Object();

    public static SingletonLazy getInstance() {
        if (instance == null) {
            synchronized (locker) {
                if (instance == null) {
                    instance = new SingletonLazy();
                }
            }
        }
        return instance;
    }

    private SingletonLazy() {

    }
}

public class demo23 {
    public static void main(String[] args) {
        SingletonLazy s1 = SingletonLazy.getInstance();
        SingletonLazy s2 = SingletonLazy.getInstance();
        System.out.println(s1 == s2);
    }
}
